The story
The noun is derived from in- (prefix meaning ‘in, into; within’) + wick (“shot where the played bowl or stone touches a stationary bowl or stone just enough that the former changes direction”) (etymology 5). The verb is derived from the noun; by surface analysis, in- + wick (“to strike (a stationary stone) with one’s own stone just enough that the former changes direction”) (etymology 5).
Etymology from Wiktionary, CC BY-SA 4.0.